I have a Bison Armory stainless 16" 1-11 4 groove in a recon profile. The barrel was made by ER Shaw, and shoots my handloads well under MOA, and sometimes under .5 MOA if I get lucky. Ben is great to work with, and puts out a quality product for the money. I was going to just buy my bolt and barrel from Bison, but Ben requested I send him the RRA upper, and the YHM forearm I was going to use and he assembeled the entire upper, and test fired it, at no charge other than the parts I bought from him. I've had zero issues with my upper since I got it over two years ago. I recently had Ben build a second upper for a friend, and it seems as if is going to perform just as mine does.